netdev - Re: [RFC] csum experts, csum_replace2() is too expensive

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Message-ID: <1395426617.9117.0.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 21 Mar 2014 11:30:17 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	kaber@...sh.net, herbert@...dor.apana.org.au, hkchu@...gle.com,
	mwdalton@...gle.com, netdev@...r.kernel.org
Subject: Re: [RFC] csum experts, csum_replace2() is too expensive

On Fri, 2014-03-21 at 14:07 -0400, David Miller wrote:

> Yeah the csum_replace*() are extremely suboptimal.
> 
> We should be able to cons up something cheap like the trick that
> ip_decrease_ttl() uses.
> 
> https://tools.ietf.org/html/rfc1624
> https://tools.ietf.org/html/rfc1141

Thanks for the pointers, I'll cook a patch.



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